400 HO block with windage tray and A/C. Ames says a 3 piece dipstick is used. The previous owner had used a homemade 1 piece copper tube.

I see how the bottom part goes thru the windage tray, but the second piece is not flared to fit the bottom section. I assume the flare it has is for the a/c connection.

Any help to figure this out is appreciated. Here are the pics of what I have.

The bottom tube in your 2nd picture( straight tube with flared end and a slight curve ) is to be installed from the inside of the block with the straight end up through the hole in the block by tapping on the flared end until the flared end is flush with the bottom of the block trying not to damage or distort the round flare as this is where the curved windage tray tube fits into.
The upper curved tube with the bracket fits into the straight end of the block tube.
You will have to remove the windage tray to install the block tube and determine which direction the slight curve should point on the block tube before tapping into block.

I thought that might be a possibility but the straight portion is just a hair too small to fit the upper oil dipstick. Maybe I need to coax it a bit to fit. I tried but it did not want to fit in there.

Also, the slight bend of the tube, does this face forward our outward from the block? What clock position if I were looking at it from the top of the engine...bend at 7:00 o'clock or so?

Maybe the best way to determine which way to point the slight curve is to put the head and exhaust manifold with gasket on with a couple bolts on that side to see where the dipstick has to fit between the head and exhaust manifold without interference with the exhaust manifold gasket.